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02-28-2008, 02:56 PM #1Regular Guest
- Join Date
- Apr 2003
- Ohio Valley
American Standard furnace problem
American Standard, model: AUD140R960A1, s/n: H2650 8858
Ignition Module: WR 50A51-405 (Trane pt CNT1308)
Problem: Igniter was bad, yet WR gas valve opens during start up sequence and lets gas into the burners without igniter on. It will fire on the new igniter I installed. It completes heating cycle and shuts down as it should. No code on module except normal call for heat function. New one on me. Certainly this is not normal. Control should not open gas valve unless it has an igniter signal, right? Any help as to what to check is appreciated. Thanks, sonny
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Last edited by jrbenny; 02-28-2008 at 03:37 PM. Reason: no emails in posts...put it in your profile
02-28-2008, 03:01 PM #2
i seen this once and ended up replacing the board. i think the new one is a "redo" design as well.If Guns Kill People, Do Pencils Misspell Words?
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02-28-2008, 03:07 PM #3Professional Member
- Join Date
- Feb 2007
If your gas valve was staying open without the (old) ignitor ever glowing, then you have some problems, and should call a HVAC company right away.
02-28-2008, 03:39 PM #4
That control has no clue if the ignitor works or not, Yes it will open the gas valve but will shut down the gas valve in a couple of seconds if no flame is present. If Im thinking of the correct controller it will only give a code if it locks out.
02-28-2008, 03:41 PM #5Professional Member*
- Join Date
- Aug 2007
- Northern VA 38 degrees N by 76 degrees W
that is not abnormal the board does not know when the igniter has reached ignition temp, it then closes gas valve goes into a purge cycle and tries again up to three times before lock out.
02-28-2008, 04:03 PM #6
Is it the correct ignitor? Some ignitors take longer to reach ignition temp than others.A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
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02-28-2008, 10:39 PM #7
02-28-2008, 10:40 PM #8
02-28-2008, 10:41 PM #9
Wrong forum for so much info.